What tyres to use?

Hi, I just got a new Renault Clio 1.4 manual and it came with 165/65 R14 tyres. I think I want more rubber on the tarmac so I am looking at my options. The manufacture recommends 185/60 R14 but I was thinking of up-sizing to a 195/50 R15. Is the Clio too underpowered for the bigger size? I know the handling will improve but how will the steering feel after the change? What other things do I have to look out for, e.g. tyre pressure, off-set etc? Thanks.